♪ whatever your business challenge, dell has the technology and services to help you solve it. >>> good evening from washington. i'm john king reporting live from the national mall. >> and good evening, everyone, i'm erin burnett. hundreds of thousands of americans are going to join the ones you see here gathering to watch presidential barack obama to take the ceremonial oath of office. >> the big public events are tomorrow. the president, though, officially began his second term at noon today, six hours ago, on this, january 20th, as required, of course, by the united states constitution. chief justice john roberts administered the oath at the white house. >> please raise your right hand and repeat after me. i barack hussein obama do solemnly swear. >> i barack hussein obama do solemnly swear. >> that i will faithfully execute. >> that i will faithfully execute. >> the office of president of the united states. >> the office of president of the united states. >> and will to the best of my ability. >> and will to the best of my ability. >> preserve, protect and defend the constitution of